Nibbling tool



Feb. 22, 1966 E, L. HALL 3,235,963

NIBBLING TOOL Filed June 13, 1963 2 Sheets-Sheet 1 IN VEN TOR JM MM V MM- United States Patent 3,235,963 NIBBLING TOOL Emery L. Hall, Hinsdale, 11]., assignor to Ski! Corporation, Chicago, IlL, a corporation of Delaware Filed June 13, 1963, Ser. No. 287,606 3 Claims. (Cl. 30228) This invention relates to hand tools and more particularly to a new and improved nibbling tool.

It is an object of the present invention to provide a nibbling tool including a cutter plate detachably fixed to the tool and having one edge of the plate adapted for coaction with a cutting edge on a reciprocating cutter bar to perform a nibbling operation upon reciprocation of the cutter bar.

It is a further object of the present invention to provide the cutter plate of the nibbling tool with an aperture for permitting free ejection of chips nibbled by the cutter bar.

It is another object of the present invention to detachably fix the cutter plate to the tool housing and to provide the cutter plate with a plurality of edges each of which is adapted for co-action with the cutting edge of the cutter bar to perform a nibbling operation, whereby the cutter plate may be selectively positioned on the housing for presenting a second edge for co-action with the cutter bar when one of the edges of the cutter plate becomes worn.

It is even another object of the present invention to provide a nibbling tool having improved means for detachably securing the cutter bar for reciprocatory movement.

Still another object of the present invention is the provision of a nibbling tool having improved means for guiding the reciprocating cutter bar.

These and other objects and advantages of the invention will become apparent from the following specification wherein like numerals refer to similar parts throughout.

In the drawings:

FIG. 1 is a side view partially in elevation and partially in section, of one embodiment of the nibbling tool of this invention;

FIG. 2 is an enlarged, fragmentary, plan view of a portion of the nose of the nibbling tool;

FIG. 3 is an enlarged section taken along line 3-3 of FIG. 1;

FIG. 4 is an enlarged section taken along line 4-4 of FIG. 1; and

FIG. 5 is a view of the movable components of the nibbling tool.

Now referring to the drawings, the nibbling tool shown for purposes of illustration will be seen to include a housing having a handle 11 (fragmentarily shown) secured thereto. Housing 10 contains a motor (not shown), preferably an electric motor, for rotating a drive shaft 13 having a cylindrical member 14 secured to the lower end thereof and rotatably supported in a roller bearing assembly 15, the roller bearing assembly being suitably mounted in a housing portion 16. The electric motor contained in housing 10 is operated by a switch 18 actuated by a trigger 19 suitably supported in handle 11.

A pin 21 is eccentrically mounted on cylindrical member 14. A link 22 (FIGS. 1 and 5) has one end thereof pivotally secured to pin 21 and the other end thereof pivotally mounted on a pin 23, pin 23 being secured to a movable member 24 (FIG. 4). A first guide block 26 secured to a housing portion 10a, as by screws 27, includes a linear groove 28 for slidably receiving movable member 24 to confine the latter for movement in a rectilinear reciprocal path. It will be apparent that rotation of shaft 13 and cylindrical member 14 will result in reciprocal movement of member 24 in groove 28 by reason of link 22 and the eccentrically mounted pin 21. Mov- Patented Feb. 22, 1966 ICC able member 24 includes a central, elongated cavity 30 having a longitudinal axis extending parallel with the path of movement of member 24. Movable member 24 includes a first transversely extending through bore 31 opening into cavity 30 for forming a semicircular recess in the upper wall of the latter. A pin 32 is retained in bore 31, pin 32 having opposite ends thereof substantially flush with respective opposite sides. of member 24 for clearing opposite side wall portions of groove 28. Movable member 24 further includes a pair of co-axial bores 33 opening into cavity 30 at side walls of the latter. A second pin 34 has opposite ends thereof retained in bores 33. Pin 34 also has opposite ends thereof in substantial flush engagement with respective opposite outer side walls of movable member 24 for clearing opposite side walls in groove 28 to permit free sliding movement of the movable member in guide block 26.

An elongated cutter bar 36 has one end thereof detachably secured in cavity 30 of the movable member with the longitudinal axis of the cutter bar extending parallel with a longitudinal axis of cavity 30. Cutter bar 36 includes a transversely extending, semi-cylindrical recess 37 near the inner end thereof for receiving the semicircular portion of pin 32 within cavity 30. The cutter bar also includes an integral lip portion 36a at the inner end thereof, which lip portion is adapted to be received between pin 34 and the upper wall of cavity 30.

Cutter bar 36, which is generally rectangular in cross section but tapering outwardly toward the outer elon gated face thereof, includes a notched or cut-out portion 39 in the outer face thereof. An insert member 40, preferably made of carbide, is suitably secured in notch 39, as by brazing, which insert has a V-shaped edge 40a (FIGS. 2 and 5) for defining a cutting edge on cutter bar 36.

Cutter bar 36 has a chip stripper provided at the outer end thereof. The chip stripper is formed by providing the cutter bar With a co-axial cylindrical portion 36b at the outer end thereof, which cylindrical portion defines an annular shoulder 43 at the juncture of the cylindrical portion with the main portion of the cutter bar. Cylindrical portion 36b is threaded at the extreme outer end thereof for receiving a nut 44. A cup-like stripper member 45 having a continuous outwardly extending flange 46 is provided on the cutter bar, the stripper member having a generally centrally disposed bore for freely receiving cylindrical portion 36b. Stripper member 45 is constantly urged into engagement with shoulder 43 by a coil spring 48 encircling cylindrical portion 36a and having one end thereof abutting the stripper element and having the other end thereof abutting nut 44. Flange portion 46 of the stripper element acts to separate chips cut from a sheet material, such as sheet 50 shown in phantom lines in FIG. 1, while permitting axial movement of the cutter bar relative to the stripper member during the nibbling operation in a manner well known in the art.

Inner and outer housing plates 52 and 53, respectively, are secured to housing 10 by a plurality of screws 54 (FIG. 2) for retaining movable member 24 in groove 28 and for retaining link 22 on pins 21 and 23. The forward end of inner housing plate 52 contains a central slot 55 extending parallel with cavity 30 for accommodating the portion of cutter bar 36 projecting outwardly beyond the cavity of the movable member. The forward end of outer housing plate 53 overlies the inner end of the cutter bar acting to retain the same within cavity 30 .of movable member 24.

A second or outer guide block 57 is secured to the nose portion of casing 10 by a pair of bolts 58. Guide block 57 includes a linear slot 59 co-axial with cavity 30 in the movable member for slidably receiving and Q guiding the cutter bar during reciprocal movement of the latter.

A cutter plate 61 is detachably secured to the lower face of guide block 57 by a plurality of bolts 62. Cutter plate 61 has a continuous groove 63 extending along the length thereof adapted to confront slot 59 when the cutter plate is secured in place for accommodating the portion of the cutter bar projecting beyond slot 59. Cutter plate 61 has an edge 65 extending transversely of cutter bar 36 in close proximity to the outer elongated face f the latter for co-acting with cutting edge 40a to perform a nibbling operation upon reciprocation of the cut-ter bar. The cutter plate also includes an aperture 66 opening into groove 63 near edge 65 permitting ejection of chips nibbled during the nibbling operation.

The cutter plate includes a second edge 68 opposite and parallel with edge 65. It should be apparent that cutter plate 61 may be detached, rotated 180 and secured again to guide block 57 to present edge 68 for co-action with cutting edge 40a to provide a nibbling operation upon reciprocation of the cutter bar. By this construction a second edge for co-aotion with cutting edge 40a is available when edge 65 becomes damaged or worn. The cutter plate includes a second aperture 69 opening into groove 63 near edge 68 permitting ejection 10f chips when edge 63 co-acts with cutting edge 40a of the cutter bar. Cutter bar 36 may be easily detached from the tool by removing cutter plate 61 and respective inner and outer housing plates 52 and 53. After these plates have been removed, the cutter bar may be separated from movable member 24 by rotating the former around pin 34 thereby separating pin 32 from recess 37 in the cutter bar. Removal of the housing plates also permits removal of link 22 and separation of the movable member 24 from groove 28 in guide block 26. The cutter bar may be easily re-engaged in cavity 30 in the movable member by inserting lip portion 36a between pin 34 and the upper wall of cavity 30 and by swinging the cut-ter bar into the cavity .until recess 37 receives pin 32.

The clearances between movable member 24 and groove 28 and cutter bar 36 and complementary shaped groove 59 have been exaggerated in FIGS. 3 and 4. It

will be understood that groove 28 and slot 59 are dimensioned to provide smooth sliding movement of movable member 24 and the cutter bar, respectively. Likewise, groove 63 in the cutter plate is dimensioned for smoothly receiving the portion of the cutter bar projecting beyond slot 59 in guide block 57.

While the invention has been shown in but one form it will be obvious to those skilled in the art that it is not to be so limited, but on the contrary it is susceptible of various changes and modifications without departing from the spirit and scope of the. appended claims.

I claim:

1. A nibbling tool comprising, a housing having a generally planar open face and mounting drive means for rotating a member having an eccentrically mounted pin, a link in said housing parallel with and adjacent said face, which link has one end thereof pivotally mounted on said pin, a movable member in said housing pivotally mounted to the other end of said link, first guide means in said housing for guiding said movable member for movement in a rectilinear reciprocal 4. path parallel with said planar face, said movable member including 'a cavity opening toward said face and having one axis thereof extending parallel with the path of movement of the movable member, an elongated .cutter bar having its longitudinal axis parallel with said axis and having a cutting edge provided on one elongated face thereof, which bar has one end thereof disposed in said .cavity in detach-able engagement with said movable member and the other end thereof disposed exteriorly of said housing, second guide means fixed to said housing adjacent and outwardly of said first guide means, which second guide means includes a slot for slid-ably receiving said cutter bar, a cutter plate fixed to said second guide means in close parallel spaced relation with said one face of the cutter bar, said plate having one edge thereof extending generally transversely of the cutter bar for co-acting with said cutting edge to perform a nibbling operation upon reciprocation of the cutter bar, and a housing plate removably fixed to said housing and closing the open face thereof, saidhousing plate being in slida ble supporting engagement with said link.

2. A nibbling tool comprising, 'a housing including drive means for rotating .a member having an eccentrically mounted pin, a link having one end thereof pivotally mounted on said pin, a movable member pivotally mounted to the other end of said link, a first guide block supported by said housing and being provided with a groove for slidably receiving said movable member to confine the latter for movement in a rectilinear reciprocal path, said movable member including a cavity 0pen ing outwardly of said housing and having one axis thereof extending parallel with the path of movement of the movable member, an elongated cutter bar provided on one elongated face thereof with a cutting edge extending generally transversely of the bar, which bar has one end thereof detachably secured in said cavity, a housing plate removably fixed to said housing end overlying saidcavity for retaining said one end of the cutter bar in said cavity, a second guide block carried by said housing adjacent and outwardly of said first guide block, which second guide block includes a slot co-axial with said -cavity, a cutter plate generally parallel with said housing plate and detachably secured to said second guide block in overlying relation with said slot, said cutter plate being in close parallel spaced relation with said one face of the cutter bar and having one edge thereof extending generally transversely of the cutter bar for coacting with said cutting edge to perform a nibbling operation upon reciprocation of the cutter bar.

3. The tool according to claim 2 wherein said cutter plate is provided with an aperture contiguous with said one edge thereof for permitting ejection of chips nibbled by said cutter bar.

References Cited by the Examiner UNITED STATES PATENTS 2,201,599 5/1940 Trautmann 30228 2,278,174 3/ 1942 Gray 30228 2,376,590 5/ 1945 Forss 30228 X 2,579,773 12/1951 Williams 30-35Q WILLIAM FELDMAN, Primary Examiner.

MILTON S. MEH'R, Examiner. 

1. A NIBBLING TOOL COMPRISING, A HOUSING HAVING A GENERALLY PLANAR OPEN FACE AND MOUNTING DRIVE MEANS FOR ROTATING A MEMBER HAVING AN ECCENTRICALLY MOUNTED PIN, A LINK IN SAID HOUSING PARALLEL WITH AND ADJACENT SAID FACE, WHICH LINK HAS ONE END THEREOF PIVOTALLY MOUNTED ON SAID PIN, A MOVABLE MEMBER IN SAID HOUSING PIVOTALLY MOUNTED TO THE OTHER END OF SAID LINK, FRIST GUIDE MEANS IN SAID HOUSING FOR GUIDING SAID MOVABLE MEMBER FOR MOVEMENT IN A RECTILINEAR RECIPROCAL PATH PARALLEL WITH SAID PLANAR FACE, SAID MOVABLE MEMBER INCLUDING A CAVITY OPENING TOWARD SAID FACE AND HAVING ONE AXIS THEREOF EXTENDING PARALLEL WITH THE PATH OF MOVEMENT OF THE MOVABLE MEMBER, AN ELONGATED CUTTER BAR HAVING ITS LONGITUDINAL AXIS PARALLEL WITH SAID AXIS AND HAVING A CUTTING EDGE PROVIDED ON ONE ELONGATED FACE THEREOF WHICH BAR HAS ONE END THEREOF DISPOSED IN SAID CAVITY IN DETACHABLE ENGAGEMENT WITH SAID 